Cloth beam take-up device for weaving looms



Oct. 4, 1955 J. PICANOL 2,719,540

CLOTH BEAM TAKE-UP DEVICE FOR WEAVING LOOMS Filed Sept. 27, 1951 4 Sheets-Sheet 1 Jaime PJC l /%%S Oct. 4, 1955 J. PICANOL CLOTH BEAM TAKE-UP DEVICE FOR WEAVING LOOMS Filed Sept. 27 1951 4 Sheets-Sheet 2 Jazkz ica/20! M ATIDAWE/S Gd. 4, 1955 J. PICANOL CLOTH BEAM TAKE-UP DEVICE FOR WEAVING LOOMS 4 Sheets-Sheet 3 Filed Sept. 27, 1951 wmvm? Ja me P ORA/5Y8 CE. 4, 1955 p c o 2,719,540

CLOTH BEAM TAKE-UP DEVICE FOR WEAVING LOOMS Filed Sept. 2'7, 1951 4 Sheets-Sheet 4 I/Wf/WUR /e Pa Z United States Patent CLOTH BEAM TAKE-UP DEVICE FOR WEAVING LOOMS Jaime Picanol, Zandberg, Zillebeke-lez-Ypres, Belgium Application September 27, 1951, Serial No. 248,607

7 Claims. (Cl. 139312) The present invention relates to a cloth beam pick-up device for weaving looms, and more particularly for automatic weaving looms.

In known weaving looms, the rotation of said cloth beam is obtained by the friction of a roller, generally known as take-up roller, which is driven by a device comprising at least one ratchet wheel, actuated by a pawl which is itself moved by an oscillating lever driven by the main shaft of the loom. Between the ratchet wheel and the take-up roller there is interposed an adjustment plate with shiftable pinions, so that the rotation of said ratchet wheel can be transmitted to said take-up roller by adapting the speed to the requirements of the take-up in relation to the weaving speed which, however, is variable according to the density of the cloth to be woven. As the density of the weft varies from one cloth to another, it is necessary to change quite frequently the weft pick gear trains, which requires adjusting each time the position of the intermediate pinion centers on the adjustment plate, as the distances between said centers vary essentially according to the combination of the pinions used.

This adjustment, which is unavoidable each time the weft density is changed on the loom, results in a loss of time for the weaver and requires a certain skill, because the gears must mesh with a tolerance of a few thousandths of an inch, otherwise they will not run smoothly and will wear rapidly.

The object of the invention is the provision of a new gear train ar-angement for weaving looms and more specifically for automatic weaving looms; whereby to eliminate systematically the adjustment plate, said arrangement being characterized by two intermediary shafts with a constant distance between their axes.

Substantially, the apparatus of the invention comprises two such shafts, one of which carries a pinion adapted to mesh with each of the pinions of a determined group on the second shaft, said last named pinions having teeth corrected to allow their correct meshing with the pinion of the first shaft, the distance between the shaft axes remaining unchanged.

For example, if the pinion mounted on the first shaft is a pinion with 20 teeth, it will mesh equally well with pinions having respectively 18, 19, 20, 21, 22 or 23 teeth.

It is thus possible to obtain a series of primary 20 tooth pinions and the modulus of which is progressive such as modulus l.251.501.752.00-2.25 etc. meshing with a small group of pinions with corrected denture.

In this manner it is possible, and without the conventional adjustment plate, to cover the whole series of weft densities occurring in practice.

A further object of the invention is the provision of an arrangement for facilitating changing the pinions, despite the constant dstance between the shaft axes.

The invention will be better disclosed in the detailed description hereafter of an embodiment of a device 2,719,540 Patented Oct. 4, 1955 according to the present invention, this description referring to the accompanying drawings, in which:

Figure 1 shows schematically the relative position of the take-up roller in the frame of a loom.

Figure 2 is a side elevation of the take-up arrangement as seen from the inside of the frame.

Figure 3 shows a side elevation of the device as seen from the outside of the frame.

Figure 4 is a front elevation of the take-up roller de- 0 vice, and

Figures 5 and 6 represent schematically the mounting of the pick-off gears.

In this embodiment, the lay sword I is pivotally connected to the end of one of the arms of a bell crank lever 2 through the intermediary of a connecting rod 3. The bell crank lever 2 is mounted loose on a shaft 4. On said shaft are also mounted a ratchet wheel 5 and a flywheel 6. The second arm of the bell crank lever 2 has a pawl 7 the spur 8 of which is held against the above mentioned ratchet wheel 5 by a spring 9.

A pick-off gear 10 is mounted on the end of shaft 4 opposite the flywheel 6. Said end of the shaft 4 has a series of splines 11 and the gear 10 has a central bore having splines corresponding in number, shape, and dimensions to the splines 11. The pick-off gear 10 meshes with a second splined pick-off gear 12 mounted on a splined shaft 19.

These two pick-off gears may slide along their respective splined shafts but can, also, be kept in place by two bosses 13, 14 provided on the inner side of a movable safety cover 15. This cover 15 is pivoted on a fixed shaft 16 'and is of substantially triangular shape, extended in a manner to cover partly the pick-off gears 10-12; said cover can be firmly secured in operating position by a handle 17 threaded in the side of the cover opposite the shaft 16, in such a manner as to clamp tightly the said cover 15.

The shaft 4 (Fig. 5) extends somewhat beyond the shaft 19 on which is placed the second pick-01f gear; this arrangement facilitates the setting-up of said pickoff gears.

Said shaft 19 carries at its other end the pinion 20 which meshes with the wheel 21 keyed on the shaft 22 carrying the pinion 23 which, in turn drives the wheel 24 on the shaft 25. The latter shaft carries the take-up roller 26 which frictionally drives the cloth beam 27.

The operating principle of the take-up device is thus very simple. The ratchet wheel 5 receives its rotational movement by means of the pawl 7 impelled by the bell crank lever 2 which is itself driven positively by the lay sword I through the connecting rod 3. The ratchet wheel 5 drives shaft 4 which in turn drives the cloth beam 27 in the manner noted above through the intermediary of pick-off gears 10 and 12. To change the pick-off gears 10 and 12, in order to vary the gear ratio, it is only necessary to loosen the handle 17 and to rotate the cover 15 in the direction of the arrow F to disengage completely the space reserved for the two pick-off gears. One is slid at the end of the shaft 4 and the other slipped in place at the end of the shaft 19. This placement of the gears is greatly facilitated by the fact that the two ends of the splined shafts 4 and 19 are not of the same length or, more exactly, both ends are not disposed in the same vertical plane. The splined end 11 of the shaft 4 protrudes slightly beyond the end of the shaft 19; this enables engaging quite easily, first, the pick-off gear 12 in place and to engage, thereafter, the other pick-off gear 10 in meshing position with gear 12, despite the fact that the distance between the shafts 4 and 19 is constant.

When the two pick-off gears 10 and 12 are in place, the cover 15 is brought back into operating position partly covering the gears 10 and 12 and holding said gears in place on their respective shafts by means of bosses 13 and 14. A few turns of the handle 17 will clamp the cover 15 in operating position.

Obviously, the change of the two pick-01f gears is extremely simple and rapid and, in any case, much easier than the Well known set-up with the adjustment plate which not only requires the shifting of the gears shifted but, also, the lateral displacement of the gear shafts to bring them in correct position. Thus the shocks and trials inherent to the known gear changing method are eliminated by the device according to the present invention.

From the foregoing, it should be clear that the device of the invention, although extremely simple, embodies a remarkable application of corrected denture gears with the consequences that the operation of the weaving loom is very much simplified.

What I claim is:

1. In a take-up device for the cloth beam of weaving looms having a lay sword, at least one ratchet wheel driven by said lay sword, a shaft driven by said wheel, a first pick-01f gear mounted on said shaft, a second shaft parallel to the first and of constant spacing therebetween, a second pick-off gear on said second shaft and meshing with the first gear said second pick-off gear being chosen from a group of gears each having a different number of teeth and each adapted to mesh with said first pickoff gear, a take-up roller, a gear train between said roller and the second pick-off gear including a third shaft parallel with said first and second shafts and of constant spacing therebetween, a pinion mounted on said second shaft, and a gear wheel mounted on said third shaft and meshing with said pinion, means for facilitating the placement of the pick-off gears on their respective shafts, and means for holding said gears onto said respective shafts.

2. In a take-up device for Weaving looms having an oscillatable lay sword, at least one ratchet wheel actuated by said lay sword, a shaft splined at one end driven by said wheel, a first pick-off gear splined over said shaft, a second splined shaft parallel to the first and of constant spacing therefrom, a second pick-01f gear splined on the second shaft and meshing with the first gear said second pick-01f gear being chosen from a group of gears each having a different number of teeth and each adapted to mesh with said first pick-off gear, a take-up roller, a gear train between said roller and said second pick-off gear including a third shaft parallel with the first and second shafts and of constant spacing therebetween, a pinion mounted on said second shaft and a gear wheel mounted on said third shaft and meshing with said pinion, means for facilitating the placement of the Pick offgears in meshing relation, and means for holding said pick-off gears in place.

3. In a take-up device for weaving looms, a first shaft, a bell crank lever freely pivoted on said first shaft, at least one ratchet wheel secured to one end of said first shaft, a spring pressed pawl on one arm of the bell crank lever for engaging the ratchet wheel, means for oscillating the other arm of the crank, a first pickoif gear removably secured at the other end of said first shaft, a second shaft parallel to the first and of constant spacing therefrom, a second pick-off gear on said second shaft meshing with the first pick-E gear, said second pick-off gear being chosen from a group of gears each having a different number of teeth and each adapted to mesh with said first pick-01f gear, a take-up roller, a gear train between said roller and said second pick-01f gear including a third shaft parallel with said first and second shafts and of constant spacing therebetween, a pinion mounted on said second shaft and a gear wheel mounted on said third shaft and meshing with said pinion, means for facilitating the placement of the pick-off gears on said first and second shafts in meshing relation, and means for holding said gears upon said first and second shafts.

4. In a take-up device for weaving looms, at least one ratchet wheel progressively advanced in relation to the loom speed, a shaft having splines at one end and driven by the ratchet wheel mounted at the other end, a first pick-offgear splined onto the shaft, a second shaft also carrying splines and disposed in immovable parallel relation to the first shaft, a second pick-off gear splined to the second shaft and meshing with the first gear said second pick-01f gear being chosen from a group of gears each having a different number of teeth and each adapted to mesh with said first pick-oifgear, a take-up roller, a gear train between said roller and said second gear including a third shaft parallel with said first and second shafts and of constant spacing therebetween, a pinion mounted on said second shaft, a gear wheel mounted on said third shaft and meshing with said pinion, a fourth shaft parallel with said first, second and third shafts of constant spacing therebetween, a second pinion mounted on said third shaft, and a second gear wheel mounted on said fourth shaft and meshing with said second pinion, said take-up roller being mounted on said fourth shaft, the splined ends of the first and second shafts projecting unequally so that the pick-off gear first splined will clear the other pick-off gear for easy meshing of the two, and means for holding the pick-off gears against longitudinal displacement.

5. In a take-up device for weaving looms, at least one ratchet wheel progressively advanced in relation to the loom feed, a first shaft having splines at one end and driven by the ratchet wheel mounted at the other end, a first pick-off gear splined onto the first shaft, a second shaft also carrying splines and disposed in immovable parallel relation to the first shaft, a second pick-01f gear splined to the second shaft and meshing with the first gear, said second pick-off gear chosen from a group of gears each having a different number of teeth and each adapted to mesh with said first pick-off gear, a take-up roller, a gear train between said roller and said second pick-off gear, the splined ends of the first and second shafts projecting unequally so that the pick-off gear first splined will clear the other pick-off gear for easy meshing of the two, and a cover pivoted adjacent the pick-off gears and parallel with the plane thereof and means for clamping said cover in gear retaining position.

6, In a device as claimed in claim 5, the means for clamping said cover comprising a threaded set screw having a bent handle for securing the cover against movement around its pivot.

7. In a device as claimed in claim 6, abutments on the inside face of said cover for preventing longitudinal sliding of the pick-off gears.

References Cited in the file of this patent UNITED STATES PATENTS 769,580 Anderson Sept. 6, 1904 948,024 Rhoades Feb. 1, 1910 1,157,666 Bennett Oct. '26, 1915 1,963,808 Robertson June 19, 1934 2,021,432 Santon -s Nov. 19, 1935 2,534,572 Burdett Dec. 19, 1950 

